DTC P0131:00: Notes

DTC P0131:00	A/F sensor circuit low input
DETECTION CONDITION	The PCM monitors the input voltage from the A/F sensor while the engine is running. If the input voltage is below 1.2 V for 1 s , the PCM determines that the A/F sensor circuit voltage is low. Diagnostic support note This is a continuous monitor (A/F sensor, HO2S). The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA (Mode 2)/Snapshot data is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	A/F sensor connector or terminal malfunction Short to ground in wiring harness between A/F sensor terminal B and PCM terminal 2AD Short to ground in wiring harness between A/F sensor terminal D and PCM terminal 2AC Short to ground in wiring harness between A/F sensor terminal F and PCM terminal 2Z PCM connector or terminal malfunction A/F sensor malfunction PCM malfunction